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What about its weight?

More importantly, what failure modes does it have? Do you have to have GPS lock to takeoff? What if you lose it while flying?

At DEFCON someone demonstrated dropping drones from the sky by spoofing GPS coordinates to inside an airport. Funny, but it guarantees I won't be buying one of them because of the potential for harm to my camera, etc.

https://www.youtube.com/watch?v=5CzURm7OpAA

I don't know, but Phantom have been doing it for years, so you could see how they do it.

30g.

http://www.alibaba.com/product-detail/wholesale-price-1575-4...

I haven't had good luck with style of GPS module on my models, even a <100 mW 5.8 GHz FPV transmitter tends to swamp the GPS signal to the point where getting a lock is impossible.

They're also prohibitively heavy on smaller models. A 10% increase in mass (for a 300g quadrotor) can shave an entire minute off of your run time.

That's just the antenna. Also, you can't get an actual GPS receiver for under a $1, around $10 is a bit more reasonable for a low price.

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